Datasheet LTC3375 (Analog Devices) - 6
| Manufacturer | Analog Devices |
| Description | 8-Channel Programmable, Parallelable 1A Buck DC/DCs |
| Pages / Page | 36 / 6 — e lecTrical characTerisTics The. denotes the specifications which apply … |
| File Format / Size | PDF / 517 Kb |
| Document Language | English |
e lecTrical characTerisTics The. denotes the specifications which apply over the specified operating
Model Line for this Datasheet
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LTC3375
e lecTrical characTerisTics The
l
denotes the specifications which apply over the specified operating junction temperature range, otherwise specifications are at TA = 25°C (Note 2). VCC = VIN1-8 = 3.3V, unless otherwise specified. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Interface Logic Pins (EN1, EN2, EN3, EN4, EN5, EN6, EN7, EN8)
VHI_ALLOFF Enable Rising Threshold All Regulators Disabled l 400 730 1200 mV VEN_HYS Enable Hysteresis 60 mV VHI Enable Rising Threshold At Least One Regulator Enabled l 380 400 420 mV IEN Enable Pin Leakage Current EN = VCC = VIN = 5.5V –1 1 µA
Pushbutton Parameters, CT = 0.01µF
tPB_LO PB Low Time to IRQ Low ON High 28 50 72 ms tPB_ON PB Low Time to ON High 140 200 260 ms tPB_OFF PB Low to ON Forced Low 7 10 13 sec tHR Time for Which All Enabled Regulators ON High 0.7 1 1.3 sec Are Disabled After KILL is Asserted High tIRQ_PW IRQ Minimum Pulse Width ON High 28 50 72 ms tKILLH Time in Which KILL Must Be Asserted After ON Rising Edge 7 10 13 sec High tKILLL KILL Low Time to ON Low ON High 28 50 72 ms tRST RST Assertion Delay 160 230 300 ms
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings (TJ in °C) is calculated from the ambient temperature (TA in °C) and may cause permanent damage to the device. Exposure to any Absolute power dissipation (PD in Watts) according to the formula: Maximum Rating condition for extended periods may affect device TJ = TA + (PD • θJA) reliability and lifetime. where θJA (in °C/W) is the package thermal impedance.
Note 2:
The LTC3375 is tested under pulsed load conditions such that
Note 3:
The LTC3375 includes overtemperature protection which protects TJ ≈ TA. The LTC3375E is guaranteed to meet specifications from the device during momentary overload conditions. Junction temperatures 0°C to 85°C junction temperature. Specifications over the –40°C to will exceed 150°C when overtemperature protection is active. Continuous 125°C operating junction temperature range are assured by design, operation above the specified maximum operating junction temperature characterization and correlation with statistical process controls. The may impair device reliability. LTC3375I is guaranteed over the –40°C to 125°C operating junction temperature range. The LTC3375H is guaranteed over the –40°C to 150°C
Note 4:
Static current, switches not switching. Actual current may be operating junction temperature range. High junction temperatures degrade higher due to gate charge losses at the switching frequency. operating lifetimes; operating lifetime is derated for junction temperatures
Note 5:
The current limit features of this part are intended to protect the greater than 125°C. Note that the maximum ambient temperature IC from short term or intermittent fault conditions. Continuous operation consistent with these specifications is determined by specific operating above the maximum specified pin current rating may result in device conditions in conjunction with board layout, the rated package thermal degradation over time. impedance and other environmental factors. The junction temperature 3375fd 6 For more information www.linear.com/3375 Document Outline Features Applications Description Typical Application Table of Contents Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Application Related Parts Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Buck Switching Regulators Buck Regulators with Combined Power Stages Pushbutton Interface Power-Up and Power-Down Via Pushbutton Power-Up and Power-Down Via Enable Pin or I2C I2C Interface I2C Bus Speed I2C Start and Stop Conditions I2C Byte Format I2C Acknowledge I2C Slave Address I2C Sub-Addressed Writing I2C Bus Write Operation I2C Bus Read Operation Error Condition Reporting Via RST and IRQ Pins Temperature Monitoring and Overtemperature Protection RESET_ALL Functionality Programming the Operating Frequency VCC Shunt Regulator Watchdog Timer Applications Information Buck Switching Regulator Output Voltage and Feedback Network Buck Regulators Combined Buck Regulators VCC Shunt Regulator Input and Output Decoupling Capacitor Selection Choosing the CT Capacitor Programming the Global Register Programming the RST and IRQ Mask Registers Status Byte Read Back Typical Applications Package Description Typical Application Related Parts
e lecTrical characTerisTics The
l
denotes the specifications which apply over the specified operating junction temperature range, otherwise specifications are at TA = 25°C (Note 2). VCC = VIN1-8 = 3.3V, unless otherwise specified. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Interface Logic Pins (EN1, EN2, EN3, EN4, EN5, EN6, EN7, EN8)
VHI_ALLOFF Enable Rising Threshold All Regulators Disabled l 400 730 1200 mV VEN_HYS Enable Hysteresis 60 mV VHI Enable Rising Threshold At Least One Regulator Enabled l 380 400 420 mV IEN Enable Pin Leakage Current EN = VCC = VIN = 5.5V –1 1 µA
Pushbutton Parameters, CT = 0.01µF
tPB_LO PB Low Time to IRQ Low ON High 28 50 72 ms tPB_ON PB Low Time to ON High 140 200 260 ms tPB_OFF PB Low to ON Forced Low 7 10 13 sec tHR Time for Which All Enabled Regulators ON High 0.7 1 1.3 sec Are Disabled After KILL is Asserted High tIRQ_PW IRQ Minimum Pulse Width ON High 28 50 72 ms tKILLH Time in Which KILL Must Be Asserted After ON Rising Edge 7 10 13 sec High tKILLL KILL Low Time to ON Low ON High 28 50 72 ms tRST RST Assertion Delay 160 230 300 ms
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings (TJ in °C) is calculated from the ambient temperature (TA in °C) and may cause permanent damage to the device. Exposure to any Absolute power dissipation (PD in Watts) according to the formula: Maximum Rating condition for extended periods may affect device TJ = TA + (PD • θJA) reliability and lifetime. where θJA (in °C/W) is the package thermal impedance.
Note 2:
The LTC3375 is tested under pulsed load conditions such that
Note 3:
The LTC3375 includes overtemperature protection which protects TJ ≈ TA. The LTC3375E is guaranteed to meet specifications from the device during momentary overload conditions. Junction temperatures 0°C to 85°C junction temperature. Specifications over the –40°C to will exceed 150°C when overtemperature protection is active. Continuous 125°C operating junction temperature range are assured by design, operation above the specified maximum operating junction temperature characterization and correlation with statistical process controls. The may impair device reliability. LTC3375I is guaranteed over the –40°C to 125°C operating junction temperature range. The LTC3375H is guaranteed over the –40°C to 150°C
Note 4:
Static current, switches not switching. Actual current may be operating junction temperature range. High junction temperatures degrade higher due to gate charge losses at the switching frequency. operating lifetimes; operating lifetime is derated for junction temperatures
Note 5:
The current limit features of this part are intended to protect the greater than 125°C. Note that the maximum ambient temperature IC from short term or intermittent fault conditions. Continuous operation consistent with these specifications is determined by specific operating above the maximum specified pin current rating may result in device conditions in conjunction with board layout, the rated package thermal degradation over time. impedance and other environmental factors. The junction temperature 3375fd 6 For more information www.linear.com/3375 Document Outline Features Applications Description Typical Application Table of Contents Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Application Related Parts Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Buck Switching Regulators Buck Regulators with Combined Power Stages Pushbutton Interface Power-Up and Power-Down Via Pushbutton Power-Up and Power-Down Via Enable Pin or I2C I2C Interface I2C Bus Speed I2C Start and Stop Conditions I2C Byte Format I2C Acknowledge I2C Slave Address I2C Sub-Addressed Writing I2C Bus Write Operation I2C Bus Read Operation Error Condition Reporting Via RST and IRQ Pins Temperature Monitoring and Overtemperature Protection RESET_ALL Functionality Programming the Operating Frequency VCC Shunt Regulator Watchdog Timer Applications Information Buck Switching Regulator Output Voltage and Feedback Network Buck Regulators Combined Buck Regulators VCC Shunt Regulator Input and Output Decoupling Capacitor Selection Choosing the CT Capacitor Programming the Global Register Programming the RST and IRQ Mask Registers Status Byte Read Back Typical Applications Package Description Typical Application Related Parts
